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Your search keyword '"Chance, J L"' showing total 9 results
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9 results on '"Chance, J L"'

1. Near-threshold production of the multi-strange $��^-$ hyperon

Author

Chung, P., Ajitanand, N. N., Alexander, J. M., Anderson, M., Best, D., Brady, F. P., Case, T., Caskey, W., Cebra, D., Chance, J. L., Cole, B., Crowe, K., Das, A. C., Draper, J. E., Gilkes, M. L., Gushue, S., Heffner, M., Hirsch, A. S., Hjort, E. L., Holzmann, W., Huo, L., Issah, M., Justice, M., Kaplan, M., Keane, D., Kintner, J. C., Klay, J., Krofcheck, D., Lacey, R. A., Lauret, J., Lisa, M. A., Liu, H., Liu, Y. M., Milan, J., McGrath, R., Milosevich, Z., Odyniec, G., Olson, D. L., Panitkin, S., Porile, N. T., Rai, G., Ritter, H. G., Romero, J. L., Scharenberg, R., Srivastava, B., Stone, N. T. B, Symons, T. J. M., Taranenko, A., Whitfield, J., Wienold, T., Witt, R., Wood, L., Zhang, W. N., and Oeschler, H.

Subjects
Nuclear Theory, FOS: Physical sciences, Nuclear Experiment (nucl-ex), Nuclear Experiment
Abstract

The yield for the multi-strange $��^{-}$ hyperon has been measured in 6 AGeV Au+Au collisions via reconstruction of its decay products $��^{-}$ and $��$, the latter also being reconstructed from its daughter tracks of $��^{-}$ and p. The measurement is rather close to the threshold for $��^{-}$ production and therefore provides an important test of model predictions. The measured yield for $��^{-}$ and $��$ are compared for several centralities. In central collisions the $��^{-}$ yield is found to be in excellent agreement with statistical and transport model predictions, suggesting that multi-strange hadron production approaches chemical equilibrium in high baryon density nuclear matter., Submitted to PRL

Published
2003
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2. Comparison of Source Images for protons, $\pi^-$'s and $\Lambda$'s in 6 AGeV Au+Au collisions

Author

Chung, P., Ajitanand, N. N., Alexander, J. M., Anderson, M., Best, D., Brady, F. P., Case, T., Caskey, W., Cebra, D., Chance, J. L., Cole, B., Crowe, K., Das, A. C., Draper, J. E., Gilkes, M. L., Gushue, S., Heffner, M., Hirsch, A. S., Hjort, E. L., Huo, L., Justice, M., Kaplan, M., Keane, D., Kintner, J. C., Klay, J., Krofcheck, D., Lacey, R. A., Lauret, J., Lisa, M. A., Liu, H., Liu, Y. M., McGrath, R., Milosevich, Z., Odyniec, G., Olson, D. L., Panitkin, S., Porile, N. T., Rai, G., Ritter, H. G., Romero, J. L., Scharenberg, R., Srivastava, B., Stone, N. T. B, Symons, T. J. M., Whitfield, J., Witt, R., Wood, L., Zhang, W. N., Brown, D., Pratt, S., Wang, F., and Danielewicz, P.

Subjects
Nuclear Theory, Nuclear Experiment
Abstract

Source images are extracted from two-particle correlations constructed from strange and non-strange hadrons produced in 6 AGeV Au + Au collisions. Very different source images result from pp vs p$\Lambda$ vs $\pi^-\pi^-$ correlations. These observations suggest important differences in the space-time emission histories for protons, pions and neutral strange baryons produced in the same events.

Published
2002

3. Comparison of Source Images for protons, $��^-$'s and $��$'s in 6 AGeV Au+Au collisions

Author

Chung, P., Ajitanand, N. N., Alexander, J. M., Anderson, M., Best, D., Brady, F. P., Case, T., Caskey, W., Cebra, D., Chance, J. L., Cole, B., Crowe, K., Das, A. C., Draper, J. E., Gilkes, M. L., Gushue, S., Heffner, M., Hirsch, A. S., Hjort, E. L., Huo, L., Justice, M., Kaplan, M., Keane, D., Kintner, J. C., Klay, J., Krofcheck, D., Lacey, R. A., Lauret, J., Lisa, M. A., Liu, H., Liu, Y. M., McGrath, R., Milosevich, Z., Odyniec, G., Olson, D. L., Panitkin, S., Porile, N. T., Rai, G., Ritter, H. G., Romero, J. L., Scharenberg, R., Srivastava, B., Stone, N. T. B, Symons, T. J. M., Whitfield, J., Witt, R., Wood, L., Zhang, W. N., Brown, D., Pratt, S., Wang, F., and Danielewicz, P.

Subjects
Nuclear Theory, FOS: Physical sciences, Nuclear Experiment (nucl-ex), Nuclear Experiment
Abstract

Source images are extracted from two-particle correlations constructed from strange and non-strange hadrons produced in 6 AGeV Au + Au collisions. Very different source images result from pp vs p$��$ vs $��^-��^-$ correlations. These observations suggest important differences in the space-time emission histories for protons, pions and neutral strange baryons produced in the same events.

Published
2002
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4. Laying the groundwork at the AGS: Recent results from experiment E895

Author

E895 Collaboration, Lisa, M. A., Ajitanand, N. N., Alexander, J. M., Anderson, M., Best, D., Brady, F. P., Case, T., Caskey, W., Cebra, D., Chance, J. L., Chung, P., Cole, B., Crowe, K., Das, A. C., Draper, J. E., Gilkes, M. L., Gushue, S., Heffner, M., Hirsch, A. S., Hjort, E. L., Huo, L., Justice, M., Kaplan, M., Keane, D., Kintner, J. C., Klay, J., Krofcheck, D., Lacey, R. A., Law, C., Lauret, J., Liu, H., Liu, Y. M., McGrath, R., Milosevich, Z., Odyniec, G., Olson, D. L., Panitkin, S. Y., Pinkenburg, C., Porile, N. T., Rai, G., Ritter, H. G., Romero, J. L., Scharenberg, R., Schroeder, L., Srivastava, B., Stone, N. T. B., Symons, T. J. M., Wang, S., Wells, R., Whitfield, J., Wienold, T., Witt, R., Wood, L., and Zhang, W. N.

Subjects
Physics, Nuclear and High Energy Physics, Time projection chamber, Nuclear Theory, FOS: Physical sciences, Strangeness production, Spectral line, Nuclear physics, Interferometry, Correlation function (statistical mechanics), Pion, Particle flow, Nuclear Experiment (nucl-ex), Nuclear Experiment
Abstract

The E895 Collaboration at the Brookhaven AGS has performed a systematic investigation of Au+Au collisions at 2-8 AGeV, using a large-acceptance Time Projection Chamber. In addition to extensive measurements of particle flow, spectra, two-particle interferometry, and strangeness production, we have performed novel hybrid analyses, including azimuthally-sensitive pion HBT, extraction of the six-dimensional pion phasespace density, and a first measurement of the Lambda-proton correlation function., Presented at Quark Matter 2001, 8 pages, 5 figures

Published
2001

5. Anti-flow of K$^0_s$ Mesons in 6 AGeV Au + Au Collisions

Author

Chung, P., Ajitanand, N. N., Alexander, J. M., Anderson, M., Best, D., Brady, F. P., Case, T., Caskey, W., Cebra, D., Chance, J. L., Cole, B., Crowe, K., Das, A., Draper, J. E., Gilkes, M. L., Gushue, S., Heffner, M., Hirsch, A. S., Hjort, E. L., Huo, L., Justice, M., Kaplan, M., Keane, D., Kintner, J. C., Klay, J., Krofcheck, D., Lacey, R. A., Lauret, J., Lisa, M. A., Liu, H., Liu, Y. M., McGrath, R., Milosevich, Z., Odyniec, G., Olson, D. L., Panitkin, S. Y., Pinkenburg, C., Porile, N. T., Rai, G., Ritter, H. G., Romero, J. L., Scharenberg, R., Schroeder, L., Srivastava, B., BStone, N. T., Symons, T. J. M., Wienold, T., Whitfield, R. Witt J., Wood, L., and Zhang, W. N.

Subjects
Nuclear Theory, FOS: Physical sciences, Nuclear Experiment (nucl-ex), Nuclear Experiment
Abstract

We have measured the sideward flow of neutral strange ($K^0_s$) mesons in 6 AGeV Au + Au collisions. A prominent anti-flow signal is observed for an impact parameter range (b $\lesssim 7$ fm) which spans central and mid-central events. Since the $K^0_s$ scattering cross section is relatively small in nuclear matter, this observation suggests that the in-medium kaon vector potential plays an important role in high density nuclear matter., 5 pages, including 3 figs

Published
2001

6. Directed Flow of $\Lambda$-Hyperons in 2-6 AGeV Au+Au Collisions

Author

Chung, P., Ajitanand, N. N., Alexander, J. M., Anderson, M., Best, D., Brady, F. P., Case, T., Caskey, W., Cebra, D., Chance, J. L., Cole, B., Crowe, K., Das, A., Draper, J. E., Gilkes, M. L., Gushue, S., Heffner, M., Hirsch, A. S., Hjort, E. L., Huo, L., Justice, M., Kaplan, M., Keane, D., Kintner, J. C., Klay, J., Krofcheck, D., Lacey, R. A., Lauret, J., Lisa, M. A., Liu, H., Liu, Y. M., McGrath, R., Milosevich, Z., Odyniec, G., Olson, D. L., Panitkin, S. Y., Pinkenburg, C., Porile, N. T., Rai, G., Ritter, H. G., Romero, J. L., Scharenberg, R., Schroeder, L., Srivastava, B., BStone, N. T., Symons, T. J. M., Wienold, T., Whitfield, R. Witt J., Wood, L., and Zhang, W. N.

Subjects
Nuclear Theory, Nuclear Experiment
Abstract

Directed flow measurements for $\Lambda$-hyperons are presented and compared to those for protons produced in the same Au+Au collisions (2, 4, and 6 AGeV; $b < 5 - 6$ fm). The measurements indicate that $\Lambda$-hyperons flow consistently in the same direction and with smaller magnitudes than those of protons. Such a strong positive flow [for $\Lambda$s] has been predicted in calculations which include the influence of the $\Lambda$-nucleon potential. The experimental flow ratio $\Lambda$/p is in qualitative agreement with expectations ($\sim 2/3$) from the quark counting rule at 2 AGeV but is found to decrease with increasing beam energy., Comment: 5 pages including 4 Figs. Submitted to Phys. Rev. Lett

Published
2001

7. Directed Flow of $��$-Hyperons in 2-6 AGeV Au+Au Collisions

Author

Chung, P., Ajitanand, N. N., Alexander, J. M., Anderson, M., Best, D., Brady, F. P., Case, T., Caskey, W., Cebra, D., Chance, J. L., Cole, B., Crowe, K., Das, A., Draper, J. E., Gilkes, M. L., Gushue, S., Heffner, M., Hirsch, A. S., Hjort, E. L., Huo, L., Justice, M., Kaplan, M., Keane, D., Kintner, J. C., Klay, J., Krofcheck, D., Lacey, R. A., Lauret, J., Lisa, M. A., Liu, H., Liu, Y. M., McGrath, R., Milosevich, Z., Odyniec, G., Olson, D. L., Panitkin, S. Y., Pinkenburg, C., Porile, N. T., Rai, G., Ritter, H. G., Romero, J. L., Scharenberg, R., Schroeder, L., Srivastava, B., BStone, N. T., Symons, T. J. M., Wienold, T., Whitfield, R. Witt J., Wood, L., and Zhang, W. N.

Subjects
Nuclear Theory, FOS: Physical sciences, Nuclear Experiment (nucl-ex), Nuclear Experiment
Abstract

Directed flow measurements for $��$-hyperons are presented and compared to those for protons produced in the same Au+Au collisions (2, 4, and 6 AGeV; $b < 5 - 6$ fm). The measurements indicate that $��$-hyperons flow consistently in the same direction and with smaller magnitudes than those of protons. Such a strong positive flow [for $��$s] has been predicted in calculations which include the influence of the $��$-nucleon potential. The experimental flow ratio $��$/p is in qualitative agreement with expectations ($\sim 2/3$) from the quark counting rule at 2 AGeV but is found to decrease with increasing beam energy., 5 pages including 4 Figs. Submitted to Phys. Rev. Lett

Published
2001
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8. Azimuthal Dependence of Pion Interferometry at the AGS

Author

E895 Collaboration, Lisa, M. A., Ajitanand, N. N., Alexander, J. M., Anderson, M., Best, D., Brady, F. P., Case, T., Caskey, W., Cebra, D., Chance, J. L., Chung, P., Cole, B., Crowe, K., Das, A. C., Draper, J. E., Gilkes, M. L., Gushue, S., Heffner, M., Hirsch, A. S., Hjort, E. L., Huo, L., Justice, M., Kaplan, M., Keane, D., Kintner, J. C., Klay, J., Krofcheck, D., Lacey, R. A., Lauret, J., Liu, H., Liu, Y. M., McGrath, R., Milosevich, Z., Odyniec, G., Olson, D. L., Panitkin, S. Y., Pinkenburg, C., Porile, N. T., Rai, G., Ritter, H. G., Romero, J. L., Scharenberg, R., Schroeder, L., Srivastava, B., Stone, N. T. B., Symons, T. J. M., Wells, R., Whitfield, J., Wienold, T., Witt, R., Wood, L., and Zhang, W. N.

Subjects
Physics, Nuclear and High Energy Physics, Plane (geometry), Nuclear Theory, FOS: Physical sciences, Position and momentum space, Azimuth, Pion, Tilt (optics), Orientation (geometry), Perpendicular, Atomic physics, Coordinate space, Nuclear Experiment (nucl-ex), Nuclear Experiment
Abstract

Two-pion correlation functions, measured as a function of azimuthal emission angle with respect to the reaction plane, provide novel information on the anisotropic shape and orientation of the pion-emitting zone formed in heavy ion collisions. We present the first experimental determination of this information, for semi-central Au+Au collisions at 2-6 AGeV. The source extension perpendicular to the reaction plane is greater than the extension in the plane, and tilt of the pion source in coordinate space is found to be opposite its tilt in momentum space., Comment: 7 pages, 5 figures; minor tweaks on revision

Published
2000
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9. Nuclear Multifragmentation, percolation and the Fisher Droplet Model: common features of reducibility and thermal scaling

Author

Elliott, J. B., Moretto, L. G., Phair, L., Wozniak, G. J., Albergo, Sebastiano Francesco, Bieser, F., Brady, F. P., Caccia, Z., Cebra, D. A., Chacon, A. D., Chance, J. L., Choi, Y., Costa, Salvatore, Gilkes, M. L., Hauger, J. A., Hirsch, A. S., Hjort, E. L., Insolia, Antonio, Justice, M., Keane, D., Kintner, J. C., Lindenstruth, V., Lisa, M. A., Matis, H. S., Mcmahan, M., Mcparland, C., Mueller, W. F. J., Olson, D. L., Partlan, M. D., Porile, N. T., Potenza, R., Rai, G., Rasmussen, J., Ritter, H. G., Romanski, J., Romero, J. L., Russo, G. V., Sann, H., Scharenberg, R. P., Scott, A., Shao, Y., Srivastava, B. K., Symons, T. J. M., Tincknell, M., Tuve', Cristina Natalina, Wang, S., Warren, P. G., Wieman, H. H., Wienold, T., Wolf, AND K., and Eos, Collaboration

Subjects
Physics, Nuclear Theory, General Physics and Astronomy, FOS: Physical sciences, Nuclear system, Surface energy, symbols.namesake, Thermal, Boltzmann constant, Cluster size, Exponent, symbols, Statistical physics, Multiplicity (chemistry), Nuclear Experiment (nucl-ex), Nuclear Experiment, Scaling
Abstract

It is shown that the Fisher Droplet Model (FDM), percolation and nuclear multifragmentation share the common features of reducibility (stochasticity in multiplicity distributions) and thermal scaling (one-fragment production probabilities are Boltzmann factors). Barriers obtained, for cluster production on percolation lattices, from the Boltzmann factors show a power-law dependence on cluster size with an exponent of 0.42 +- 0.02. The EOS Au multifragmentation data yield barriers with a power-law exponent of 0.68 +- 0.03. Values of the surface energy coefficient of a low density nuclear system are also extracted., Comment: four pages and five figures

Published
2000

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